Al-Kāfi

Hadith 1647
friday-prayerhealth-hygiene
7ـ مُحَمَّدُ بْنُ إِسْمَاعِيلَ عَنِ الْفَضْلِ بْنِ شَاذَانَ عَنِ ابْنِ أَبِي عُمَيْرٍ عَنْ حَفْصِ بْنِ الْبَخْتَرِيِّ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ الْسَّلام) قَالَ أَخْذُ الشَّارِبِ وَالأظْفَارِ مِنَ الْجُمُعَةِ إِلَى الْجُمُعَةِ أَمَانٌ مِنَ الْجُذَامِ.
7. Muhammad ibn ’Isma‘il has narrated from al-Fadl ibn Shadhan from Ibn Abi ‘Umayr from Hafs ibn al-Bakhtariy who has said the following: “Abu ‘Abd Allah (a.s.), has said, ‘Trimming one’s mustache, and fingernails every Friday is protection against leprosy.’”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī